December 7, 20178 yr If you or a friend have access to a PC with a CD or USB connector, then you can either download a live Linux - or create yet one more unRAID thunb drive. There are lots of live versions of Linux that contains a large set of repair tools to handle all common file systems and also has tools to mirror disks, scan raw disk surface for lost file data etc. As long as you manage to boot a machine with just about any recent Linux, then you would have access to the required command-line tool to try a file system repair. And as @johnnie.black is describing - parity works to restore a disk to the state it had when the parity was generted. That means that a software goof that writes bad data to a disk and breaks the file system will also get mirrored into the parity. That's also why a RAID can only be considered as one file copy and can not replace the need for backup. Erase/overwrite a file and that erase/overwrite gets mirrored to the parity information.
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